Journalism 101
(1) Journalists don't like to be sued. Their bosses don't like spending money defending lawsuits that cost a pile even if they win. If you challenge lance without evidence, you run the risk of getting your bum handed to you. There is no percentage in taking such a risk when THERE IS NO NEW NEWS TO REPORT.
(2) Sportswriting is ALL about cliche. The hero overcoming adversity is a seductive story that sells. A journalist would be a fool to ignore that story.
(3) Another cliche, maybe the greatest, is the hero's fall from grace. Look at Mark McGuire and Georgie Best. Their descents were covered in excruciatingly redundant detail. IF EVIDENCE DEVELOPS, then you can bet that the journos will swarm the story with all the cliche-generating skills that they can muster.
(4) Most journalists lack autonomy. They don't get to write what they want. They're slaves of their editors, who are in turn slaves of their capitalist owners. Don't blame them for trying to keep their sweet sportswriting job.
(5) Stop thinking that sportswriting is news. It's promotion. Heck, the Tour itself started out as a newspaper promotion.